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An acute angle, because the legs of an R are smaller than a right angle.
Let r be the angle of the ray, and R the angle of reflection.If the wall is flat (i.e., if its angle is 0), then we know that r + R = Pi/2.Now suppose the wall has angle w. Then rotate the diagram by -w,so that the wall is now flat again, and the angles of the ray and itsreflection are now r - w and R - w, respectively.We then have (r - w) + (R - w) = Pi/2, which should give you enoughinformation to find R.
If you know the radius and the angle (in radians) then r*x where r = radius, x = angle. If the angle is in degrees, then pi*r*x/180 Otherwise you have to measure it.
The letter "R".
my answer is R